My first Mac arriving shortly. Even if I use the Photos app I will want to keep the photos also in my own albums on the iMac. 1. Can I use Apple TV to get the photos to the TV from the iMac and have a good viewing experience? 2. The iMac will be one floor below the TV. Can I waken up the iMac from the Apple TV, and send it to sleep again? You will gather that my ignorance here runs pretty deep. All advice gratefully received.